22 Treffer

This technical report is the Emerging Trends proceedings of the 20th International Conference on Theorem Proving in Higher Order Logics (TPHOLs 2007), which was held during 10-13 September in Kaiserslautern, Germany. TPHOLs covers all aspects of theorem proving in higher order logics as well as related topics in theorem proving and veri&#64257;cation.

Magnetic spin-based memory technologies are a promising solution to overcome the incoming limits of microelectronics. Nevertheless, the long write latency and high write energy of these memory technologies compared to SRAM make it difficult to use these for fast microprocessor memories, such as L1- Caches. However, the recent advent of the Spin Orbit Torque (SOT) technology changed the story: indeed, it potentially offers a writing speed comparable to SRAM with a much better density as SRAM and an infinite endurance, paving the way to a new paradigm in processor architectures, with introduction of non- volatility in all the levels of the memory hierarchy towards full normally-off and instant-on processors. This paper presents a full design flow, from device to system, allowing to evaluate the potential of SOT for microprocessor cache memories and very encouraging simulation results using this framework.

Lowering the supply voltage of Static Random-Access Memories (SRAM) is key to reduce power consumption, however since this badly affects the circuit performances, it might lead to various forms of loss of functionality. In this work, we present silicon results showing significant yield improvement, achieved with write and read assist techniques on a 6T high- density bitcell manufactured in 40 nm technology. Data is successfully modeled with an original spice-based method that allows reproducing at high computing efficiency the effects of static negative bitline write assist, the effects of static wordline underdrive read assist, while the effects of read ability losses due to low-voltage operations on the yield are not taken into account in the model.

Component fault trees that contain safety basic events as well as security basic events cannot be analyzed like normal CFTs. Safety basic events are rated with probabilities in an interval [0,1], for security basic events simpler scales such as \{low, medium, high\} make more sense. In this paper an approach is described how to handle a quantitative safety analysis with different rating schemes for safety and security basic events. By doing so, it is possible to take security causes for safety failures into account and to rate their effect on system safety.

Memory accesses are the bottleneck of modern computer systems both in terms of performance and energy. This barrier, known as "the Memory Wall", can be break by utilizing memristors. Memristors are novel passive electrical components with varying resistance based on the charge passing through the device [1]. In this abstract, the term "memristor" covers also an extension of the definition, memristive devices, which vary their resistance depending on a state variable [2]. While memristors are naturally used as memory cells, they can also be used for other applications, such as logic circuits [3].
We present a novel architecture that redefines the relationship between the memory and the processor by enabling data processing within the memory itself. Our architecture is based on a memristive memory array, in which we perform two basic logic operations: Imply (material implication) [4] and False.

In the Iranian public media, it was widely reported that by the end of 2004, 380 hectares of the eastern farthest end of the Peninsula Mianqala (northern part of Iran, located in the southeastern coasts of Caspian Sea) were sold to an organisation – the result is that "Asurada" Island will be turned into a so-called “Tourist Village”. The decision has been made and civil works are to begin. The village planned as a new settlement is specifically considered to work with Mianqala, which since June 1976 is an international biosphere reserve and since 1969, an Iranian nature protected area. Considering the special condition of the region as a biosphere reserve, this paper introduces the current situation of the Island Āŝūrāda and the suggested program by the aforementioned organisation. Subsequently, it tries to find an optimal answer to the question of whether "Āŝūrāda" is appropriate for such a purpose and how far it is allowed to be interfered with, through this new settlement. The paper asserts for this development, there is consideration of the settlement’s urban and architectural concept; subsequently analysis is conducted for the spatial development of the settlement, in terms of its influences on the ecological sources, the rural structure and the financial as well as social aspects. Such study is required, particularly due to the chain of tourist influences, which certainly will introduce a new pattern of urban character in terms of quality and quantity. Finally, with the assistance of the case presented, this paper poses the question of whether a new urban pattern like this can endanger a traditional and above all a nature protected context or not.

The development of autonomous vehicle systems demands the increased usage of software based control mechanisms. Generally, this leads to very complex systems, whose proper functioning has to be ensured. In our work we aim at investigating and assessing the potential effects of software issues on the safety, reliability and availability of complex embedded autonomous systems. One of the key aspects of the research concerns the mapping of functional descriptions in form of integrated behavior-based control networks to State-Event Fault Tree models.

This paper briefly discusses a new architecture, Computation-In-Memory (CIM Architecture), which performs “processing-in-memory”. It is based on the integration of storage and computation in the same physical location (crossbar topology) and the use of non-volatile resistive-switching technology (memristive devices or memristors in short) instead of CMOS technology. The architecture has the potential of improving the energy-delay product, computing efficiency and performance area by at least two orders of magnitude.

This Essay considers the motives and the formation of European New Towns, in particular German ones. For this reason it studies basically the development of German New towns, further defines the German classification of this urban term. This essay suggests additionally for this sense a kind of classification in Germany – considering to periodical as well as formal progress of German New towns. All suggested classes are specifically and individually recognized and introduced, for each one is also given specific examples. Each case is furthermore introduced and it’s motive of formation and development are considered as well, e.g. cities like Ludwigshafen, Hellerau, Wolfsburg, Wulfen. Regarding to the development of German New Towns and up to the given facts in the essay, the current and the expected situation of German New towns are finally considered, also the sense of German experiences for Iranian New towns, and it’s possible significance for them.

This technical report contains the preliminary versions of the regular papers presented at the first workshop on Verification of Adaptive Systems (VerAS) that has been held in Kaiserslautern, Germany, on September 14th, 2007 as part of the 20th International Conference on Theorem Proving in Higher Order Logics. The final versions will be published with Elsevier's Electronic Notes on Theoretical Computer Science (ENTCS). VerAS is the first workshop that aims at considering adaptation as a cross-cutting system aspect that needs to be explicitly addressed in system design and verification. The program committee called for original submissions on formal modeling, specification, verification, and implementation of adaptive systems. There were six submissions from different countries of Europe. Each submission has been reviewed by three programme committee members. Finally, the programme committee decided to accept three of the six submissions. Besides the presentations of the regular papers, the workshop's programme included a tutorial on the `Compositional Verification of Self-Optimizing Mechatronic Systems' held by Holger Giese (University of Paderborn, Germany) as well as three presentations of DASMOD projects on the verification of adaptive systems.